TIDA-01555 Reference Design

Texas Instruments

Flexible Interface (PRU-ICSS) Reference Design for Simultaneous: Coherent DAQ Using Multiple ADCs


This reference design showcases an interface implementation for connecting multiple high voltage bipolar input, 8-channel, mux-input SAR ADCs (6) with the Sitara Arm processors for expanding the number of input channels using Programmable Real-time Unit (PRU-ICSS). ADCs are configured for simultaneous sampling of the same channels across all ADCs. The design highlights the capability of PRU-ICSS to handle 1536ksps (each sample = 16 bits) data rate by sampling 640 samples per line cycle. For 50Hz cycle, this corresponds to 32ksps per channel across 6 ADCs simultaneously (640 samples/cycle*50Hz*6 ADCs*8 Ch = 1536ksps). Also, the second PRU is used to post process the data to achieve coherent sampling.

  • Flexible interface using PRU-ICSS (Sitara Processor) for communicating with multiple SAR ADCs
  • AC voltage and current measurement accuracy: AC Voltage: <±0.2% for 2.5V to 120V; AC Current: <±0.2% for 2.5A to 70A; and Simultaneous sampling across six ADCs (16-bit, 500ksps/ADC)
  • PRU-ICSS Interface: Programmable real-time unitiIndustrial communication subsystem (PRU-ICSS) offers flexible data capture for channel expansion; Firmware-based approach allows for reuse across different Sitara processors; and Coherent sampling is achieved by computing line cycle in software and by adjusting CS signal
  • Data acquisition (DAQ)
  • Multifunction relay
  • Avionics remote data concentrator
  • AC analog input module
Product Categories
  • Data converters


Part Number Name Companion Part
AM3356BZCZA30 AM3356BZCZA30 Buy Datasheet
AM3357BZCZA60 AM3357BZCZA60 Buy Datasheet
AM3358BZCE60 AM3358BZCE60 Buy Datasheet
AM3359BZCZA80 AM3359BZCZA80 Buy Datasheet
CDCLVC1106PWR CDCLVC1106PWR Buy Datasheet
LP2992IM5X-5.0/NOPB LP2992IM5X-5.0/NOPB Buy Datasheet
OPA4197ID OPA4197ID Buy Datasheet
SN74LV1T04DCKRG4 SN74LV1T04DCKRG4 Buy Datasheet
SN74LVC1G17DCK3 SN74LVC1G17DCK3 Buy Datasheet
TPS22914CYFPR TPS22914CYFPR Buy Datasheet
TPS65131RGET TPS65131RGET Buy Datasheet
TPS7A3901DSCR TPS7A3901DSCR Buy Datasheet

Bill Of Materials

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Test Data

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Other Documents

Title Updated Type Size (KB)
Flexible Interface (PRU-ICSS) Reference Design for Simultaneous, Coherent DAQ (Rev. A) 03 Jan 2019 PDF 1929
TIDA-01555 Gerber 20 Dec 2017 ZIP 7628
TIDA-01555 CAD Files 20 Dec 2017 ZIP 5446
TIDA-01555 Layer Plots 20 Dec 2017 ZIP 4674
TIDA-01555 Assembly Files 20 Dec 2017 ZIP 733
TIDA-01555 BOM Files 20 Dec 2017 ZIP 400
TIDA-01555 Schematic Files 20 Dec 2017 ZIP 1659